JPH06129524A - Electronic shift device - Google Patents

Abstract

PURPOSE:To enable prompt completion of shifting operation by having an actuator for shifting of a main transmission stood by at a neutral position immediately after the shifting operation of a auxiliary transmission is carried out. CONSTITUTION:When a speed change sensor is turned ON, a main transmission 9 is tentatively maintained at a neutral position by a control part. A shifter for switching the main transmission 9 is forcefully returned to the neutral position before a speed change lever 12 is moved forward and backward to switch an auxiliary transmission 10. The shifter of the main transmission 9 is then moved in the direction of acceleration or deceleration from the neutral position according to the shifted direction of the speed change lever 12. Shifting operation can thus be completed promptly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic shift device, and more particularly to control when shifting is changed.

[0002]

2. Description of the Related Art The applicant of the present invention has applied for an electronic shift device in the past. This electronic shift device is capable of shifting to an arbitrary position according to an electric signal. A synchromesh-type main transmission device and an auxiliary transmission device, and a hydraulic clutch for switching between forward and reverse movements are provided immediately in front of these transmission devices, and a rotation base of an operation lever for switching the auxiliary transmission device performs gear shifting. A shift sensor for detecting whether or not the operator intends and a position sensor for detecting the shift position of the auxiliary transmission are provided.When a shift operation is performed by the operation lever, first, the shift sensor operates. After the hydraulic clutch is disengaged, and then the auxiliary transmission is switched by this operation lever, the shift output is output to the shifter of the main transmission that is hydraulically operated.

[0003]

By the way, in the conventional device as described above, when the gear shift is performed by using the operation lever, the sub gear shift position sensor detects first that the sub gear shift device has been switched. However, after that, a shift output for upshifting or downshifting the shifter of the main transmission was output, so that there was a disadvantage that the shift completion operation was delayed, and there was a problem in that the operation feeling was bad. It was

[0004]

SUMMARY OF THE INVENTION The present invention is proposed in view of the above-mentioned problems, and immediately after the shift operation of the auxiliary transmission is performed, the shift actuator of the main transmission is made to stand by at the neutral position. Thus, the shift operation is completed promptly. For this reason,
The present invention has taken the following technical means.

That is, the main transmission 9 of the synchromesh type
In an electronic shift device that is configured to shift the main transmission device 9 to an arbitrary position in response to an electric signal, the operation lever for operating the auxiliary transmission device 10 is provided with the auxiliary transmission device 10 and the hydraulic clutch device 11. A gear shift sensor 15 and an auxiliary gear shift position sensor 41 are provided on the rotation base of -12, and when the gear shift sensor 15 is turned on, the main transmission 9
The electronic shift device has a configuration in which a control unit 18 for temporarily holding the control unit is provided.

[0006]

Embodiments of the present invention will be described below based on the embodiments shown in the drawings. First, the structure will be explained as follows.
Is a tractor, 2 is a front wheel, and 3 is a rear wheel. Tractor
An engine 4 is mounted on the front of the machine body, and a clutch housing 6 containing a main clutch 5 and a transmission case 8 containing a transmission are connected to the rear of the engine 4. In the mission case 8, there are a main transmission 9 capable of shifting four speeds, an auxiliary transmission 10 capable of shifting four speeds, and a forward / reverse switching device 11 for changing the traveling direction of the aircraft. They are provided in series.

The handle portion of the shift lever 12 is provided with a button type shift switch 14 for speed increase / decrease, which is operated to switch the main transmission 9 from the first speed to the fourth speed. The shift lever 12 is configured to be swingable in the front-rear direction and the left-right direction about two axes in the front-rear direction and the left-right direction. When the shift lever 12 is tilted outward in the lateral direction, the shift-sensing sensor 15 is turned on and the hydraulic clutch is disengaged. When the shift lever 12 is swung back and forth while maintaining this state, the auxiliary transmission device 10 mechanically shifts to L level.
Switching is possible within the range of four speeds of L, L, M, and H.

The main transmission 9 and the sub transmission 10 are both composed of a synchromesh type transmission, and only the forward / reverse switching device 11 is composed of a hydraulic clutch. When the main transmission 9 is switched, first, the hydraulic clutch of the forward / reverse switching device 11 is switched to OFF, and then the piston rod 1 for operating the shifter of the main transmission 9.
6 is forcibly moved in the axial longitudinal direction by hydraulic pressure, and when the shifter (not shown) reaches a predetermined shift position, the hydraulic clutch of the forward / reverse switching device 11 is connected again. In addition, all of these switching are electrically controlled.

FIG. 2 is a block diagram of the control device. The control unit 18 including a microcomputer includes solenoids 20, 21, 22, 23 for switching the main transmission device 9 and a forward / reverse switching device 11 for switching. Solenoids 25, 26 for use with the solenoid 30 and a solenoid 30 for controlling the boost control valve 28 of the forward / reverse switching device 11 are connected. Solenoids 20 and 21,
22 and 23 are paired respectively, and the former is 1st speed -2.
The switching valve 24 for the speed is controlled, and the latter controls the switching valve 27 for the third speed and the fourth speed.

Reference numeral 32 is a monitor lamp for displaying the shift position. Further, the control unit 18 includes a rotation sensor 34 for detecting the rotation speed of the engine 4, a wheel rotation sensor 35 for detecting the rotation speed of the rear wheels 3, and an F-R changeover switch provided on the forward / reverse switching lever 37. 38, a main transmission position sensor 4 for detecting the positions of shifters of the main transmission 9 and the auxiliary transmission 11.
0, the auxiliary shift position sensor 41, the shift switch 14, the shift detection sensor 15 and the like are connected.

FIG. 3 is a hydraulic circuit diagram showing the piping configuration of the entire hydraulic equipment provided in the tractor-1. Briefly describing the entire circuit configuration, the hydraulic oil sent from the main pump 45 flows into a sub control valve 46 for taking out an external hydraulic pressure, and a part of it enters a valve 48 for horizontal control via a diversion valve 47. The horizontal cylinder 49 is controlled to expand and contract. The remaining hydraulic oil divided by the flow dividing valve 47 flows into the working machine lifting control valve 50 and is sent to the main cylinder 51, and the lift arm 52 is rotated to raise and lower the working machine. is doing.

A sub-pump 55, which is independent of the main pump 45, is connected to a pressure reducing valve 57 for taking out a hydraulic oil of a constant pressure, and a power steering device utilizing the hydraulic oil kept at a constant pressure. 59, forward / reverse switching device 1
1, PTO clutch control device 60, front wheel speed control device 6
2. The electronic shift device 64 is operated. The PTO clutch control device 60 includes a PTO clutch 66 and a valve 67 that connects and disconnects the PTO clutch 66, and the front wheel speed control device 62 includes a hydraulic clutch 69 and a valve 70. The front wheel speed control device 62 includes a mode selector switch (not shown) and the front wheel 2
Is connected to a sensor that detects the turning angle of the front wheel 2 and the standard four-wheel drive state in which the speed of the front wheel 2 is substantially the same as that of the rear wheel 3.
It is configured to be able to switch to the front wheel double speed drive state in which the peripheral speed of the rear wheel 3 is increased more than that of the rear wheel 3 or the full time drive state in which 2WD or 4WD is automatically selected according to the slip state of the rear wheel 3. is doing.

FIG. 6 shows the number of shift stages of the transmission described in this embodiment, and shows the relationship between the main shift and the sub shift from the low speed first stage to the high speed 16th stage. There is. In addition, the memory in the control unit 18 stores in the shift lever-1.
A program is set such that when the sub transmission 10 is operated by using 2, the main transmission 9 is also shifted at the same time.

Specifically, when the auxiliary transmission 10 is accelerated by one stage (for example, M speed is changed to H speed), the main transmission 9 is at the lowest speed position (for example, 4 speeds) from the current shift position.
Downshifting from first speed, third speed, second speed to first speed) and conversely decelerating the auxiliary transmission 10 by one stage (for example, changing from M speed to L speed).
When operated, the main transmission 9 is configured to shift up from the current shift position to the highest speed position (for example, 1st speed, 2nd speed, 3rd speed to 4th speed).

By the way, if such a program is adopted, when the operator grips the shift lever 12 to perform a shift operation, the shift lever passes a target position or shifts to shift gears. A problem occurs when the lever 12 is tilted laterally outward, but the intention is changed again and the gear shift operation is stopped.
After all, in such a case, the main transmission 9 may be shifted to a shift position different from one's will.

For example, the current shift position is the auxiliary transmission 1.
When 0 is the M speed and the main transmission 9 is the 1st speed (gear speed; 9 speeds), the shift lever 12 is moved to the deceleration side and the auxiliary transmission 1 is operated.
Although I intend to set 0 to L speed, it moves to LL speed, and when the operator returns the shift lever 12 to L speed to correct the overshoot, the main transmission 9 is in 4th speed (gear speed: 8 speed). Instead, the vehicle will be shifted to the 1st speed (gear speed; 5 speeds). The operator has an auxiliary shift L speed and a main shift 4 speed (shift stage;
Although 8 speeds are expected, the main gear shift is 1st speed, which means that the vehicle speed is significantly reduced, resulting in a problem that work efficiency is significantly reduced.

Therefore, the following program is set in the memory of the control unit 18 of the electronic shift device 64 so as not to cause such a problem. In addition,
A control program of the present invention for temporarily holding the main transmission 9 in the neutral state during the shift operation of the sub transmission 10 will also be described. The flow chart shown in FIG. 4 is its control program, and first, the states of various sensors and switches connected to the control unit 18 are read (step S1). The shift lever-1 for the operator to shift
Shift sensor 15 turns on when gripping 2 and tilting it laterally outward
(Step S2). This shift detection sensor 15 is O
Immediately after the shift to N, it is determined whether or not the main shift position sensor (main shift sensor) 40 is in the neutral state (steps S3 and S4). If it is not in the neutral state, the sub shift position sensor (sub shift sensor) 41. The detected position of the main shift position sensor 40 is stored in the memory (steps S5 and S6).
Then, the solenoids 20, 21, 22, 23 are turned off to return the piston rod 16 of the main transmission 9 to the neutral position.
An output command to set is set (step S7).

On the other hand, when the shift lever 12 is moved in the front-rear direction to switch the sub-transmission device 10 and the shift lever 12 is returned to the lateral inner side again, the shift sensor 15 is immediately switched from ON to OFF (step S9). . At this time, if the shift lever 12 is operated in the upshifting direction, the main transmission 9 is changed to the first speed (step S11),
On the contrary, if it is operated in the downshifting direction, a command for setting the main transmission 9 to the fourth speed is set.

The shift detection sensor 15 is once turned on and then turned off.
Even if it is turned on, in other words, the operator is
When the operator tries to shift the gear once by grasping 2, the shift position of the main transmission 9 does not change at all and the stored value up to that point is set (step S14). Then, the shift operation of the main transmission 9 is performed by the control unit 18 based on these set commands (step S8).

When switching between the transmissions 9 and 10, first, the forward / reverse switching device 11 which also serves as a hydraulic clutch is set to a neutral state, and after the shift is completed, the forward / reverse switching device 11 is connected again, and the boost control valve 28 is operated. Solenoid 3
A current is applied to 0 and the clutch is gradually connected. These series of operations are performed in accordance with commands from the control unit 18, and the piston rod 16 of the main transmission 9 is moved back and forth to shift gears.

FIG. 5 illustrates the timing at which the main transmission 9 and the sub transmission 10 are switched by operating the shift lever 12 in the front-rear direction. Briefly, the shift lever
When 12 is laid sideways and the shift sensor 15 is turned on,
The hydraulic clutch of the forward / reverse switching device 11 is returned to neutral, and the boost control of the boost control valve 28 is stopped at the same time.

During this time, the shift lever 12 is in the M speed, the L speed, and the L speed.
Although it returns to the L speed again via the L speed, the main transmission 9 enters the 4th speed without entering the 1st speed, and when the main speed change position sensor 40 confirms that, the boost control works again and the forward / rearward movement is performed. The hydraulic clutch of the switching device 11 is gradually connected.

[0023]

As described above, the present invention is provided with the synchromesh type main transmission device 9, the sub transmission device 10, and the hydraulic clutch device 11, and the main transmission device 9 is placed at an arbitrary position according to an electric signal. In an electronic shift device configured to change gears, an operation lever 12 for operating the auxiliary transmission device 10.
The shift detection sensor 15 and the auxiliary shift position sensor 4
1 is provided, and when the shift detection sensor 15 is turned on, the control unit 18 for temporarily holding the main transmission 9 in the neutral state is provided. Therefore, the shift lever is moved in the front-rear direction and the sub-shift is performed. While switching the device 10, the shifter for switching the main transmission 9 is forcibly returned to the neutral position, and then the shifter of the main transmission 9 is viewed at the neutral position by looking at the shift direction of the shift lever 12. Since it only needs to move from the speed increasing direction to the speed increasing direction,
The time required to complete the shift can be greatly shortened, which contributes to improving work efficiency and also improves the operation feeling.

[Brief description of drawings]

FIG. 1 is an overall side view of a tractor.

FIG. 2 is a block diagram showing a control system.

FIG. 3 is a hydraulic circuit diagram.

FIG. 4 is a flow chart showing the contents of a control program.

FIG. 5 is a time chart showing how control is performed.

FIG. 6 is a table explaining the number of shift stages.

[Explanation of symbols]

 1 tractor 2 front wheel 3 rear wheel 4 engine 9 main transmission 10 auxiliary transmission 11 forward / reverse switching device 12 shift lever 18 control unit 40 position sensor 41 position sensor

Claims (1)

[Claims] 1. An electronic device comprising a synchromesh type main transmission device 9, an auxiliary transmission device 10, and a hydraulic clutch device 11, which is configured to shift the main transmission device 9 to an arbitrary position in response to an electric signal. In the shift device, the auxiliary transmission 1
A gear shift sensing sensor 15 and an auxiliary gear shift position sensor 41 are provided at the rotation base of the operation lever 12 for operating 0, and when the gear shift sensing sensor 15 is turned on, the main transmission 9 is temporarily set to a neutral state. An electronic shift device comprising a control unit 18 for holding the electronic shift device.